Filed in the U.S. District Court for Northern California against Gigamon, its directors, and EMC, the class alleges that the defendants violated the Securities Exchange Act by leaving investors in the dark about important financial information related to the deal.

Based in Santa Clara, California, Gigamon creates software used for network visibility and traffic monitoring.

On October 26, both companies announced the deal where New York-based EMC will pay $38.50 per share for Gigamon, which represents a 7 percent premium to the company’s closing price that day.

Gigamon shareholders, however, claim financial projections and valuation analyses performed by the company’s advisor, Goldman Sachs, was left out of SEC statements. Without this information, investors say they have no way of knowing how the company may perform in the future or how Goldman Sachs came to its fairness opinion.

“The proxy statement omits material information regarding the background of the proposed transaction. The company’s stockholders are entitled to an accurate description of the process the directors used in coming to their decision to support the proposed transaction,” the suit states.